Marcus Shelby, a notable Bay Area bassist, bandleader, composer, and educator, will be featured at the Cal Poly Spring Jazz Concert at 7:30 p.m. Friday, May 17, in the Performing Arts Center. Shelby, who was also a member of the University Jazz Band (UJB) from 1988-89, will direct the band and play bass in a set of his original compositions and arrangements. Dave Becker will direct the UJB for other pieces. The Jazz Combos, directed by Dylan Johnson, and Vocal Jazz Ensemble, directed by Inga Swearingen, will open the concert.